Ek II mm "N" for review

[mistersilver]

I recently acquired this EK II Klasse for my collection:
My impression is be it a nice and early EK, with core type "A".
The measurements are 42mm by 42.2 mm and weight of 16.8 g.
The frame tests positive for silver.
As for the brand I think it is "N" (EC Neuhaus & Son, Berlin).
These are my conclusions.
I would like very much to have your conclusions and evaluations.
Thanks Alex